A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 108
ure a good model of a funnel anddraw out the pattern. METHOD OF TRIANGLES Problem 20.—Tapering ventilator collar. Manyproblems are impossible to develop by either methodpreviouslv referred to. on account of their surfacesbeing warped. A warped surface cannot be laid out MECHANICAL DRAWING 105… … Fie. 110 106 A PRACTICAL COURSE IN scuttles, footballs, and similar objects with irregularsurfaces, are non-developable except by the approxi-mate method above referred to. Construction: Layoff on the projections of the figure small triangles atregular intervals, determine their true size and lay…
Mechanical drawing
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